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This is from the memory install information page: "Memory is not removable by users on iMac (21.5-inch, Late 2012), iMac (21.5-inch, Late 2013), and iMac (21.5-inch, Mid 2014). If the memory in one of these computers needs to be replaced, contact an Apple Retail Store or Apple Authorized Service Provider. If you’d like to upgrade the memory in one of these models, an Apple Authorized Service Provider can help."